A highly pyritised ammonite fossil of the species Echioceras raricostatum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.
The fossil measures 37 mm (1.45 inches) across. The ammonite is well preserved on both sides with detailed ribbing. It has a lovely pyritic colour and shine. These large pyrite ammonites are very sought after.
These ammonites have long been used to make natural jewellery.
Around 196 million years old, this fossil would make a wonderful addition to any collection.